CPT (Certified Phlebotomy Technician) Practice Exam

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What fluid is extracted during a lumbar puncture?

Blood
Urine
CSF
Saliva

The correct answer is: CSF

The correct answer is cerebrospinal fluid (CSF), which is the fluid extracted during a lumbar puncture. A lumbar puncture, also known as a spinal tap, is a medical procedure used to collect CSF that surrounds the brain and spinal cord. This fluid is vital for diagnosing various conditions, including infections, bleeding, and neurological disorders, as it contains essential information about the central nervous system. Blood, urine, and saliva are bodily fluids but are not the target of a lumbar puncture. Blood is typically drawn from veins for laboratory tests, urine is collected for analysis of kidney function or infection, and saliva is often used in tests for hormones or genetic material. Each of these fluids serves different diagnostic purposes and has distinct collection methods.